Optical Constants of Ultra-Short-Pulse Laser Heated Metal
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- YONEDA Hitoki
- Institute for Laser Science, University of Electro-communications
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- MORIKAMI Hidetoshi
- Institute for Laser Science, University of Electro-communications
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- UEDA Ken-ichi
- Institute for Laser Science, University of Electro-communications
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- MORE Richard M.
- National Institute for Fusion Science
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Abstract
The complex refractive index (n + ik) of ultra-short-pulse laser heated gold metal was measured with a new ellipsometric pump-probe technique. Two ratios of four different probe-beam polarizations were used to determine s- and p-reflectivity and their phase difference. In the early stage of heating, only the imaginary part of the dielectric constant ε(Im[ε] = 2nk) increased while real part of e (Re[ε] = n²-k²) was almost constant. This agrees with the Drude model. We observe a pause in the rise of Im[ε] at the boiling temperature. Beyond this point, Re[ε] started to change and the observed parameters disagree with the Drude theory. It was found that the parameters of the expanding plasma follow a unique trajectory in n, k space, even though time variation of Re[ε] and Im[ε] are different for various pump intensities. This means the gold remains in a unique state such as the neutral groundstate in this intensity range.
Journal
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- Journal of Plasma and Fusion Research
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Journal of Plasma and Fusion Research 79 (5), 449-451, 2003
The Japan Society of Plasma Science and Nuclear Fusion Research
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Details 詳細情報について
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- CRID
- 1390001206512516992
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- NII Article ID
- 130000133801
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- NII Book ID
- AN10401672
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- COI
- 1:CAS:528:DC%2BD3sXlsVGnsr4%3D
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- NDL BIB ID
- 6603890
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- ISSN
- 09187928
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed